Axial gap rotary electric machine and rotary driving device

Abstract

An axial gap rotary electric machine includes a rotor, an armature and a stator. The rotor is a magnetic body, which is capable of rotating in a circumferential direction about a rotation axis. The armature includes an armature coil opposed to the rotor from one side in a rotation axis direction parallel to the rotation axis. The stator causes the armature coil to interlink with a magnetic field flux from the other side in the rotation axis direction via the rotor.

1. An axial gap rotary electric machine, comprising:
 a rotor comprising a magnetic body and capable of rotating in a circumferential direction about a rotation axis; 
 an armature including an armature coil opposed to said rotor on one side in a rotation axis direction parallel to said rotation axis; and 
 a stator interlinking said armature coil with a magnetic field flux by supplying said rotor with said magnetic field flux on another side in said rotation axis direction, wherein said rotor includes: 
 a first magnetic ring supplied with said magnetic field flux of a first polarity from said stator; 
 a second magnetic ring disposed on a side closer to said rotation axis compared with said first magnetic ring and supplied with said magnetic field flux of a second polarity from said stator; 
 a first magnetic plate circularly disposed in said circumferential direction so as to be opposed to said armature, magnetically separated from said second magnetic ring, and magnetically coupled to said first magnetic ring; and 
 a second magnetic plate circularly disposed so as to be opposed to said armature with positions thereof in said circumferential direction alternating with the first magnetic plate, magnetically separated from said first magnetic ring and said first magnetic plate, and magnetically coupled to said second magnetic ring. 
 
     
     
       2. The axial gap rotary electric machine according to  claim 1 , wherein:
 a side opposite to said rotation axis of said first magnetic plate is coupled to said first magnetic ring and extends in a radial direction so as to reach said armature side of said second magnetic ring; and 
 said rotation axis side of said second magnetic plate is coupled to said second magnetic ring and extends so as to reach said armature side of said first magnetic ring. 
 
     
     
       3. The axial gap rotary electric machine according to  claim 1 , wherein said stator includes:
 a magnetic field coil wound in said circumferential direction, for generating said magnetic field flux; and 
 a magnetic field yoke sandwiching said magnetic field coil between an inner circumferential side and an outer circumferential side thereof, which are coupled to each other on a side opposite to said rotor. 
 
     
     
       4. The axial gap rotary electric machine according to  claim 1 , wherein said stator includes:
 a first magnetic pole surface supplying said first magnetic ring with said magnetic field flux of said first polarity; 
 a second magnetic pole surface supplying said second magnetic ring with said magnetic field flux of said second polarity; and 
 permanent magnets supplying said first magnetic pole surface and said second magnetic pole surface with said magnetic field flux. 
 
     
     
       5. The axial gap rotary electric machine according to  claim 4 , wherein:
 said permanent magnet has a circular shape around said rotation axis and is magnetized in the radial direction with respect to said rotation axis; 
 said stator further includes a first core and a second core covering said permanent magnet from an outer circumferential side and an inner circumferential side, respectively; and 
 said first core and said second core show said first magnetic pole surface and said second magnetic pole surface, respectively. 
 
     
     
       6. The axial gap rotary electric machine according to  claim 5 , wherein said stator further includes a third core for partially short-circuiting a magnetic flux generated from said permanent magnet by magnetically coupling said first core and said second core to each other from a side opposite to said rotor. 
     
     
       7. The axial gap rotary electric machine according to  claim 4 , wherein said permanent magnet shows at least any one of said first magnetic pole surface and said second magnetic pole surface. 
     
     
       8. The axial gap rotary electric machine according to  claim 7 , wherein said permanent magnet is circularly disposed in the circumferential direction. 
     
     
       9. The axial gap rotary electric machine according to  claim 8 , wherein:
 said permanent magnet shows both of said first magnetic pole surface and said second magnetic pole surface; and 
 said stator further includes:
 a first auxiliary core disposed so as to be opposed to said first magnetic ring and magnetically coupled to said first magnetic pole surface; and 
 a second auxiliary core disposed so as to be opposed to said second magnetic ring and magnetically coupled to said second magnetic pole surface. 
 
 
     
     
       10. The axial gap rotary electric machine according to  claim 4 , wherein:
 said permanent magnet shows any one of said first magnetic pole surface and said second magnetic pole surface; and 
 said stator further includes a yoke magnetically coupled to said permanent magnet and showing another of said first magnetic pole surface and said second magnetic pole surface. 
 
     
     
       11. The axial gap rotary electric machine according to  claim 4 , wherein said stator further includes a magnetic field coil wound in said circumferential direction. 
     
     
       12. The axial gap rotary electric machine according to  claim 4 , wherein said rotor further includes a plurality of magnetic bodies circularly disposed so as to be opposed to said armature with positions thereof in said circumferential direction alternating with the first magnetic plate and the second magnetic plate, and magnetically coupled to each other while being magnetically separated from said first magnetic ring and said second magnetic ring. 
     
     
       13. The axial gap rotary electric machine according to  claim 12 , wherein said rotor further includes a magnetic ring coupling said plurality of magnetic bodies to each other in the circumferential direction on the side opposite to said rotation axis. 
     
     
       14. The axial gap rotary electric machine according to  claim 12 , wherein said rotor further includes a magnetic ring coupling said plurality of magnetic bodies to each other in the circumferential direction between said first magnetic ring and said second magnetic ring. 
     
     
       15. The axial gap rotary electric machine according to  claim 12 , wherein said rotor further includes a magnetic ring coupling said plurality of magnetic bodies to each other in the circumferential direction on the side opposite to said rotation axis. 
     
     
       16. The axial gap rotary electric machine according to  claim 12 , wherein said stator further includes a projection being in proximity to said plurality of magnetic bodies. 
     
     
       17. A rotary driving device, comprising:
 the axial gap rotary electric machine according to  claim 4 ; 
 a rotation shaft coupled to said rotor while being apart from said stator; and 
 an engine disposed on a side opposite to said rotor with respect to said armature along said rotation axis direction, and coupled to said rotation shaft to provide and receive rotational movement with said rotation shaft, 
 wherein said armature is provided with a through hole causing said rotation shaft to penetrate therethrough without hampering rotation of said rotation shaft. 
 
     
     
       18. The rotary driving device according to  claim 17 , wherein an end of said rotation shaft on said stator side retracts to said engine side in said rotation axis direction with respect to said stator. 
     
     
       19. The rotary driving device according to  claim 17 , wherein said stator is provided with a heat radiation member.